Fire bar for furnaces



March 18 1924. 1,487,455

w. GIBSON ET AL FIRE BAR FOR FURNACES Filed Oct. 16. 1.922

Patented Mar. 18, 1324.

UETED STTES PATENT OFFICE.

WILLIAM GIBSON, F NEYVPOBT, ENGLAND, AND EDWARD JAiMES POCOCK, OF

. CARDIFF, WALES.

FIRE BAR FOR FURNACES.

Application filed October 16, 1922. Serial No. 595,605.

To all whom it may concern:

Be it known that we, VVILLIAM GrBsoN, of 75 Somerset Road, Newport, in the county of Monmouth, England, and EDWARD JAMES Poooon, of 62 Africa Gardens, Gabalfa, Cardiff, in the county of Glamorgan, Wales, both British subjects, have invented certain new and useful Improvements in Fire Bars for Furnaces, of which the following is a specification.

This invention is a firebar for use in furnaces of all classes of boilers, with special application to furnaces fitted with mechanical stokers, designed to expose only a small,

surface to the heat of the fire and a large surface-to the cooling draught under the grate, with provision of openings for a large air current.

Previous attempts have been made to secure the better distribution of air through the grates of boilers or other furnaces by firebars of various forms and also to provide insulation for the bar. This invention seeks to secure both results by means of a 2 firebar which comprises a series of small pockets of a particular shape attached to the top of a web piece combined in one castmg.

The pockets of boxes are. open at the top, the plan being in the shape of a rhomboid and the brim being curved or slightly bevelled inwards. The shape is modified as required at the ends of the bar.

These pockets or boxes are intended to be filled with sand, ashes or other nonconducting material to protect the metal from heat, and regular gaps are left for the passage of air which circulates all round each pocket.

Where pockets or boxes have hitherto been provided as features of firebars they have been in the shape of a square or truncated pyramid. The edges of the pockets and the transverse air spaces have thus been directly across the grate, or, in other words, at right angles to the line of the firebar. The present invention in which the pockets are in the shape of a rhomboid represents an improvement and secures the following advantages, namely:

(1) Each pocket presents an easy slide to the firing tool and so reduces the risk of breakage and the shifting of bars out of place which exist where square edges are opposed to the passage of the tool.

(2) The transverse spaces between the pockets are arranged in short diagonals across the grate, which are more effective for the passage of air, being more in conformity with its stream line flow from the mouth of the furnace than square openings, and thus assist to improve combustion,

(3) The transverse air passages are staggered across the grate to improve the dis tribution of air although only one pattern is used for all the bars, thus facilitating manufacture,

(4:) Sharp corners are provided at the back of each pocket which assist to reduce clinkering or" the fuel when operated by a mechanical rocker.

The internal shape of the pockets Or boxes permits them to be filled up to the edge and also smooths the surface for the firing tool.

The accompanying drawings illustrate the invention.

Fig. 1 shows a plan view of four or the firebars according to this invention laid side by side.

Fig. 2 shows a longitudinal section of a firebar on the line 1-1 Fig. 1.

Fig. 8 shows a cross section to a larger scale.

Fig. 4 illustrates a series of pockets.

The drawings show the rhomboid shaped pockets (4, the transverse diagonal air spaces between the pockets Z), the longitudinal air spaces between the bars 0, the web of the bar (Z, and the projections e and f at each end forming distance pieces which maintain the longitudinal air spaces.

What we claim and desire to secure by Letters Patent in the United States of America is:

A firebar for boiler furnaces comprising a central web, having a plurality of pockets at the top thereof to project on each side thereof and spaced apart from each other each pocket having four side walls, two oi which are parallel to each other and to the central web and two of which are-parallel to each other and arranged diagonally across the central web.

WILLIAM GIBSON. EDWARD JAMES POCOCK. 

